People in First Nations communities have been disproportionately affected by COVID-19, officials say. People who received two doses of the AstraZeneca vaccine may have had a “gradual waning immune response” sooner than people who got at least one dose of an mRNA vaccine. Health-care workers have a higher risk of exposure due to their work. People 70 and older have more waning immunity than those under 70 and a higher risk of severe illness from COVID-19. They say the reasons vary for including different groups in the next priority cohort. Either mRNA vaccine can be used for a booster dose, officials say.

Officials say 65 per cent of those already eligible have had a third dose. More than 250,000 people in Ontario are already eligible for third doses, including certain immunocompromised people and residents of long-term care, retirement homes and other seniors’ congregate settings.

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